Blocks stars in group drinking gallons (4)

I believe the answer is:

lego

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'blocks' is the definition.
(I've seen this before)

'stars in group drinking gallons' is the wordplay.
'stars in group' becomes 'leo' (I can't justify this - if you can you should believe this answer much more).
'drinking' indicates putting letters inside.
'gallons' becomes 'g'.
'leo' going around 'g' is 'LEGO'.

Can you help me to learn more?

(Other definitions for lego that I've seen before include "Children's building bricks" , "construction kit" , "Toy with interlocking blocks" , "Child's building bricks" , "Toy building-bricks" .)

I've seen this clue in The Independent.

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